Table 4.

Univariate and multivariable logistic regression analysis for factors that increased the blood loss^†

	Univariate analysis			Multivariable analysis
Variables	OR	95% CI	P‐value	OR	95% CI	P‐value
Age (≤50 vs. >50 years)	0.346	0.090–1.331	0.107	—	—	—
Sex (female vs. male)	0.730	0.209–2.552	0.621	—	—	—
Clinical symptoms (yes vs. no)	3.317	0.982–11.201	0.042	3.612	0.876–14.897	0.076
Location (Group I vs. Group II and III)	1.569	0.467–5.277	0.463	—	—	—
Preoperative follow‐up time (≤2 vs. >2 years)	0.734	0.212–2.601	0.767	—	—	—
Maximal diameter (>5 vs. ≤5 cm)	5.436	1.543–19.151	0.004	4.428	1.243–16.489	0.022
Diagnosed as mediastinal cyst by CT (yes vs. no)	1.174	0.350–3.938	0.795	—	—	—
Mediastinal structure damage (yes vs. no)	0.960	0.937–0.983	0.563	—	—	—
Adhesions to mediastinal structure (yes vs. no)	10.937	2.311–51.756	<0.001	9.617	2.003–46.169	0.005

^†The blood loss increased is defined as the blood loss is more than 100 mL.